Thread: my build from the start
-
24-12-2010 #11
nothing atm irving i think my 1st thing i will do is convert my milling mc to cnc :)
-
24-12-2010 #12
oh right, just those are very lightweight motors and I was wondering about your expectations of them...
-
24-12-2010 #13
Sorry, yes - 130 degrees max internal which is about 85 degrees on the case. This website seems to think 70-80 degrees is normal - bit of a useless temperature that - hot enough to want to avoid touching but not hot enough to make tea.
80 degrees above ambient is pretty tepid in my garage at the moment so I don't think it will be a problem for a while :-)
-
26-12-2010 #14
-
26-12-2010 #15
Hot enough if you're 6700m above sea level!
My motors (3nm size 23, 4.2A on 75v) rarely got hot. The vast majority of the time I can barely feel any temperature rise. It's only when the machine has been running for a long time that they start to get hot. I think the drivers reducing the current to 50% when stationary helps here.
It makes me wonder if I can up the current a bit and get a bit more torque/speed. It's on 4.09A, could try 4.64A. That'd be up to 30% more heat I think (I^2*R), or 20% above rated power.Last edited by Jonathan; 26-12-2010 at 01:09 PM.
-
26-12-2010 #16
-
26-12-2010 #17
-
28-12-2010 #18
what motors should i be looking for? the board i bought is the 2.5amp and 24v PSU.
-
28-12-2010 #19
Depends greatly on the size of your machine, are you using ballscrews/ACME etc. With only 24v you want a motor with very low inductance to get any reasonable speed.
reccomended v=32*L^0.5, so rearranging that:
L=(24/32)^2=0.56mH
So your looking for a motor with an inductance ideally lower than 0.56mH, and sufficient torque...you'll be lucky to meet those criteria so just find as close as possible.
Hope that helps...
-
The Following User Says Thank You to Jonathan For This Useful Post:
-
28-12-2010 #20
sort of helps, from this which would you say is the best to go for?
Thread Information
Users Browsing this Thread
There are currently 1 users browsing this thread. (0 members and 1 guests)
Similar Threads
-
Well here we go again, start another build
By D-man in forum Gantry/Router Machines & BuildingReplies: 5Last Post: 22-01-2014, 09:59 AM -
Build log when to start posting on this site
By ramsbury in forum General DiscussionReplies: 6Last Post: 15-01-2014, 10:43 AM -
NEW MEMBER: Hello all, finally ready to start a build log.
By Iwant1 in forum New Member IntroductionsReplies: 11Last Post: 25-12-2012, 06:03 PM -
A few questions before I start my build
By eclassic in forum General DiscussionReplies: 0Last Post: 11-07-2011, 10:54 PM -
NEW MEMBER: Were do I start?!
By tonygagey in forum New Member IntroductionsReplies: 4Last Post: 07-08-2010, 07:55 PM
Bookmarks